NITRIDING PECULIARITIES OF Fe – 3 % Si TECHNICAL ALLOY
https://doi.org/10.17073/0368-0797-2015-2-88-94
Abstract
Nitriding of the Fe – 3 % Si alloy was studied by spectral chemical analysis and scanning electron microscopy with local X-ray analysis. In-depth chemical composition was determined by glow discharge optical emission spectrometry (GD-OES). The process has been studi ed in the 500 – 1000 °C temperature range. Nitriding was performed in the proprietary system using (95 % N2 + 5 % H2 ) inert carrier gas ammoniated by passing through NH3 aqueous solution. Parameters of the nitriding were optimized. Nitriding of the Fe – 3 % Si alloy was performed after decarburization annealing. Most of nitrogen in the form of disperse Si3N4 phase is located in the near-surface region just after the inner oxide layer. Increasing the nitriding potential caused the austenite formation in the internal oxidation layer that should impair the insulating coating formation in the subsequent processing. The nitrogen content in the nitrided Fe – 3 % Si alloy decreased during the high temperature annealing; the remaining nitrogen content became equal to the aluminum content right before the beginning of abnormal grain growth.
About the Author
M. L. Lobanov
Ural Federal University named after the fi rst President of Russia B.N. Yeltsin
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor of the Chair of Phy sics and Heat Treatment of Metals
References
1. Takahashi N., Harase J. Reсent development of technology of grain oriented silicon steel. Proc. Mater. Science Forum. 1996. Vol. 204–206, pp. 143–154.
2. Kubota T., Fujikura M., Ushigami Y. Recent progress and future trend on grain-orientied silicon steel. Journal of Magnetism and Magnetic Materials. 2000. Vol. 215–216, pp. 69–73.
3. Lobanov M.L., Rusakov G.M., Redikul’tsev A.A. Electrotechnical anisotropic steel. Part I. History of development. Metal Science and Heat Treatment. 2011. Vol. 53, no. 7–8, pp. 326–332.
4. Lobanov M.L., Rusakov G.M., Redikul’tsev A.A. Electrotechnical anisotropic steel. Part II. State-of-the-art. Metal Science and Heat Treatment. 2011. Vol. 53, no. 7–8, pp. 355–359.
5. Kobayashi H., Kuroki K., Minakuchi M., Yakashiro K. Process for preparation of grain oriented electrical steel sheet comprising a nitriding treatment. Patent USA no. 4979996. 1990.
6. Fortunati S., Cicale S., Abbruzzese G. Process for the inhibition control in the production of grain-orientied electrical sheets. Patent USA no. 6361621. 2002.
7. Chun-Chin Liao, Chun-Kan Hou. Effect of nitriding time on secondary recrystallization behaviors and magnetic properties of grainoriented electrical steel. Journal of Magnetism and Magnetic Materials. 2010. Vol. 322, pp. 434–442.
8. Lobanov M.L., Gomzikov A.I., Akulov S.V. etc. Decarburizing annealing of technical alloy Fe – 3 % Si. Metal Science and Heat Treatment. 2005. Vol. 47, no. 9–10, pp. 478–483.
9. Ushigami Y., Kurosawa F., Masui H. et al. Precipitation behaviors of injected nitride inhibitors during secondary recrystallization annealing in grain oriented silicon steel. Proc. Mater. Science Forum. 1996. Vol. 204–206, pp. 593–594.
10. Kubaschewski Ortrud. Iron – binary phase diagrams. Berlin, 1982. (Russ.ed.: Kubashevski O. Diagrammy sostoyaniya dvoinykh sistem na osnove zheleza: Sprav. Moscow: Metallurgiya,
11. 184 p.).
12.
Review
For citations:
Lobanov M.L. NITRIDING PECULIARITIES OF Fe – 3 % Si TECHNICAL ALLOY. Izvestiya. Ferrous Metallurgy. 2015;58(2):88-94. (In Russ.) https://doi.org/10.17073/0368-0797-2015-2-88-94
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